A knitted-in slide fastener in which a continuous fastener element row can be mounted stably in its dimensional meaning and firmly while breaking of a needle is prevented, so as to secure a smooth engagement of elements, wherein the continuous fastener element row is fixed and knitted-in by a fixing chain knitting yarn at the same time when a fastener tape is knitted, the fixing chain knitting yarn for the elements is knitted into plural wales of a fastener element attaching portion on one side edge of the fastener tape, warp knitting yarns to be knitted for reinforcement are entangled with a needle loop formed by a constituent yarn of at least one of wales in a foundation structure adjoining the plural wales through their needle loops but not entangled with a needle loop of the fixing chain knitting yarn through their needle loops.